Core and shell for electromotors



Sept. 4, 1956 M T 2,761,984

CORE AND SHELL FOR ELECTROMOTORS Filed Jan. 19, 1953 FIG. I

W W MM grooves provided in the circumferential surface of the Accordingto Fig. 2 a similar heat-abducting system is (CURE AND SHELL FORELECTRQMOTQRS formed by a number of separate corrugated strips ll, 12,Ludwig Adam and Rudolf Haecltel, Ho n S 5 H 4 wry, and August g m p 7insernoodrment 0:. mg. 3 shows an outer sleeve formed assignors toKleiusehanzlin-Pumpen Alrtrengesellsehalt, Wlih T1108 Homhurg, SaarTerritory in all cases the sheet metal pack forming the body ofApplication January 1953, Semi: N0. 331,962 the stator is placed on amandrel (not shown) and sub- Claims priority, application GermanyEanuary 21, 952

3 Claims. (Cl. 310-64) react two diametrically opposite longitudinalgrooves 2;. have been formed, a seamless or end-welded sheet metalcylinder 3 is placed, the circumferential pressure acting on the outersurface of the cylinder forces it into close This invention relates toelectromotors and more es- Contact With the P Of laminae and also lellgipecially to the stator shells which surround the laniiinated tudinalgrooves formed in them.

cores or metal plate packs of certain electromotors. We wish it to beunderstood that we do not desire to it is an object of this invention toprovide sheet metal imi to the details disclosed in the foregoing shellsheld in place on the metal plate paclts by mere l'ric- Specification andillustrated in the drawings for obvious tion, created when pressingthese shells around the plates 20 modifications will occur to a personskilled in the art.

and into longitudinal grooves provided in the circumfer- We claim:

ential surface of the packs and into grooved cellars seated 1. Core andshell for electrornotors comprising in comon th fre e d of the platepack bination, an axially grooved laminated sheet metal core In order toprovide for an ff i t h at flew i presenting a cylindrical outersurface, We axially extendhigh-duty ele tromotor we fi o th hell propering grooves in said surface, a cylindrical sheet metal shell additionalcorrugated sheet metal sleeve which is held in 6108613 surrounding saidcore, parts of said shell swaged close heat-conductive contact with theshell and prointo the gro ves f said core to secure tightly said shellvides a large surface for the heat flow. We prefer to 516 Cora, and aplurality of Corrugated 811%? metal solder or weld the corrugated jacketto the shell. SiTiPS fiXed t0 the ut r urfa f the shell and cirin orderto facilitate the pulling down of the shell onto irimlferentially spacedfrom each other y at least one tne stator plates, we prefer to use acorrugated sheet f i gI V metal sleeve which is discontinuous in thevicinity of the 2- C r a d h ll f r electromotors comprising inlongitudinal grooves, combination, an axially grooved laminated sheetmetal The leeve may al o i t f narrow h t t l core presenting acylindrical outer surface, two axially exstrips containing only one or tcorrugatigns tending grooves in said surface, a cylindrical sheet metalThe form of the corrugations should be so chosen as Shell 3 SurroundingSaid Core, Parts Of Said Shell to provide for a certain elasticity whendrawing the shell Swaged into the grooves of Said Core to Secure lightlyonto the plates, and the strips may also be formed ith said shell to thecore, and two corrugated sheet metal longitudinal ribs formed ofaplurality of stifiening beads Strips fiXed t0 the t r urfa f th Shelland cirith t ti inner surfacw 0 cumferentially spaced from each other bysaid two In the drawings afilxed to this specification and forminggroovespart thereof several embodiments of our invention are Cofe andShell for electl'omotors Comprising in illustrated diagrammatically byway of example. bination, an axially grooved laminated sheet metal coreIn the drawings: presenting a cylindrical outer surface, two axially ex-Fig 1 i a l i of an b di h i tending grooves in said surface, acylindrical sheet metal rugated sheet metal sleeve in two parts fastenedon the Shell 3 Surrounding Said Core, Parts Of Said ll outer urfacg of hh m swaged into the grooves of said core to secure tightly said Fi 2, d3 are i il views f two more b djshell to the core, and a plurality ofsheet metal strips ments. fixed to the outer surface of the shell andcircumferen- Referring to the drawings and first to Figs. 1 and 2,tially Spaced from each Othfif y at least 1 f Said 1 is the statorproper consisting of superposed sheet metal gTOOVeS, Said Sheet InfitalStrips being cofrugatfid to rm laminae. 2 is one of a pair oflongitudinal grooves doublfi-Walled ribsformed in the free faces of thelaminae. 3 is the cylindrical steel shell surrounding the pack oflaminae, which References Clted m the file of thls Pater!t by pressurehas been forced into these grooves as shown UNITED STATES PATENTS at 20.

The sheet metal shell 3, before being placed around gfi ggi a1 5 thepack 1, has an inner diameter slightly larger than 1693839 Faudi 1978the outer diameter of the pack and can easily be placed 1775055 TarboxSept 5 around the pack, to be then forced by circumferential 1 5 Lanz I:Dec 1 1935 pressure into close contact with thapack and held in2,096,297 Goldner at a]. Oct 19 1937 place on the pack by the partprotruding into the groove 2,151,561 Merrill Mar 21 1939 2- The shellthus secures the laminae against distortion. 2,205,138 Gould Jan 1940 Inthe embodiment Shown in e 1 two Corrugated 2,215,991 Anderson et al.1.11:: Sept. 24, 1940 heat abducting sheets are fixed on the outersurface or" the shell 3 by soldering or welding, leaving free only theFOREIGN PATENTS grooved parts of the shell. 2 is one of the longitudinal334,238 Great Britain Sept. 1, 1930 -"ed to a preliminary pressure. Onthe pack, on which

